YOU SAID:

many cooks spoil the broth

INTO JAPANESE

料理人が多すぎるとスープができそこなう。

BACK INTO ENGLISH

Too many cooks spoil the broth. [Proverb]

INTO JAPANESE

船頭多くして船、山に登る。

BACK INTO ENGLISH

Too many cooks spoil the broth. [Proverb]